TWC (AS11351) blocking all NTP?

John R. Levine johnl at
Mon Feb 3 20:50:03 UTC 2014

>> I was thinking that the servers on any particular network are a small set of exceptions to a general rule to rate limit outgoing NTP traffic.
> allows any NTP operator to opt-in to receive NTP traffic should their clock be available and accurate.

I believe you, but I don't believe that the set of servers changes 
so rapidly that it is beyond the ability of network operators to handle 
the ones on their own networks as a special case.

John Levine, johnl at, Primary Perpetrator of "The Internet for Dummies",
Please consider the environment before reading this e-mail.

More information about the NANOG mailing list